Update .binstar for Python engine on windows

Author: PeterDSteinberg

.binstar.yml

@@ -50,10 +50,18 @@ script:
 - echo "PYTHONPATH below should include ./conda_tmp"
 - echo %PYTHONPATH%
  - protoci-difference-build .
+engine:
+- python=2.7
+- python=3.4
+- python=3.5
 ---
 platform: win-64
 script:
 - set PYTHONPATH=%PYTHONPATH%:.\conda_tmp\conda-build:.\conda_tmp\conda
 - echo "PYTHONPATH below should include ./conda_tmp"
 - echo %PYTHONPATH%
 - protoci-difference-build .
+engine:
+- python=2.7
+- python=3.4
+- python=3.5